Multiplex PCR Primer Libraries to Reduce Non-Target Amplicons
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Solution Overview
Problem
Current multiplex PCR methods generate non-target amplification products, such as primer dimers, which limit the use of amplified products for further analysis, especially in applications like Non-Invasive Prenatal Genetic Diagnosis (NPD), where improved sensitivity, specificity, and reduced time and cost are desired.
Innovation Solution
A method involving a library of non-immobilized primers that simultaneously hybridize to multiple target loci, using optimized annealing temperatures and primer extension conditions to minimize dimer formation, followed by sequencing or array hybridization to detect target amplicons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple oligonucleotide primers are combined in the same PCR reaction to amplify multiple target nucleic acids simultaneously, then assay throughput increases and sample usage becomes more efficient, but non-target amplification products such as primer dimers are generated
Solution Approach 1:
The patent applies preliminary action by pre-screening and selecting primer pairs based on their ability to minimize non-target amplification products before performing multiplex PCR. The method involves testing individual primer pairs to identify those that produce minimal primer dimers and non-target amplicons, then combining only these optimized primers in the multiplex reaction. This preliminary selection process ensures that the multiplex PCR generates high-quality target amplicons suitable for downstream sequencing applications.
2Adaptability or versatility
If the number of primers in multiplex PCR is increased to amplify more target loci, then more target nucleic acids can be detected simultaneously, but the risk of generating non-target amplicons increases
Solution Approach 1:
The patent applies partial action by systematically testing and evaluating individual primer pairs to determine their specific contribution to non-target amplification. Rather than arbitrarily limiting the number of primers, the method identifies the optimal subset of primer pairs that can be combined without generating harmful artifacts. This approach allows for the inclusion of as many primers as necessary to achieve comprehensive target coverage, while maintaining quality through careful selection of each individual primer's performance characteristics.
3Measurement precision
If non-target amplicons are reduced to enable further analysis of amplified products, then sensitivity and specificity of detection improve, but the complexity of primer selection and optimization increases
Solution Approach 1:
The patent applies self-service by designing a self-evaluating primer selection system where each primer pair is tested and ranked based on its own performance metrics for generating non-target amplification products. The method automatically identifies optimal primer combinations through systematic evaluation of individual primer characteristics, allowing the selection process to be driven by objective data rather than manual trial-and-error. This self-service approach streamlines the optimization process while ensuring high detection precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces non-target amplification products, enabling efficient simultaneous amplification of multiple loci with high accuracy and sensitivity, suitable for applications like NPD, by ensuring at least 50-99.5% of target amplicons are detected and sequenced.
Implementation Method 1
contacting the nucleic acid sample with a library of test primers that simultaneously hybridize to at least 25 different target loci
Implementation Method 2
subjecting the reaction mixture to primer extension reaction conditions to produce amplified products
Data Source
AI summary
The invention provides methods for simultaneously amplifying multiple nucleic acid regions of interest in one reaction volume as well as methods for selecting a library of primers for use in such amplification methods. The invention also provides library of primers with desirable characteristics, such as minimal formation of amplified primer dimers or other non-target amplicons.